RE: Unexpected flight characteristics
I will check the landing gear mains and tail wheel for correctness. Adding toe-in on the mains would be difficult as the LG is fibreglass and would require drilling the hole for the axle rods at an angle. However I will make sure that they are at least parallel to each other and to the fuselage centreline.
The ground handling is one issue but the reason for hard right roll on full throttle is something else. It is possible that a servo cable was stuck on the wing saddle although fairly sure that was not the case. Speculation! I will fly the plane again this weekend and report back one way or the other.
Thank you to all for the ideas and support.